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Stratum of limestone preserved unaltered in midst of dolomitized limestone 200 feet above the base of the Bird Spring formation in sec. 4, T. 25 S., R. 58 E., the workings of the Hoosier mine lie in the foreground. Clark County, Nevada. Circa 1921. Plate 19-A, labels and a graphic, in U.S. Geological Survey. Professional paper 162. 1931.
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Crystal Pass limestone exposed in a cliff 15 feet high in sec. 30, T.26, S. R. 59 E., south end of Spring Mountains. Clark County, Nevada. December 12, 1924. Plate 5-B in U.S. Geological Survey. Professional paper 162. 1931.
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Thin bedded dolomite of the Goodsprings formation (upper Cambrian) thrust upon the Aztec sandstone (Jurassic) in northeast corner of sec. 21, T. 22 S., R. 58 E. The contact marks the trace of the Keystone thrust. The curve in the trace is due to local irregularities in the surface and to perspective. Clark County, Nevada. Circa 1921. Plate 14-A, with a graphic, in U.S. Geological Survey. Professional paper 162. 1931.
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Escarpment of the basal sandstone of the Mesaverde formation dissected near crest of Gooseberry Dome, secs. 15, 16, 21 and 22, T. 47 N., R. 100 W. Park County, Wyoming. 1912. Plate 7-C in U.S. Geological Survey. Professional paper 145. 1926. Plate 30-A in U.S. Geological Survey. Bulletin 656. 1917.
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Ninety-nine Mine, W 1/2 sec. 15, T. 23 S., R. 58 E., the ridge on the left is made up of limestones near the base of the Bird Spring formation which dip eastward (left). The Ninety-nine fault passes through the ravine in the center. Clark County, Nevada. Circa 1921. Plate 31-B in U.S. Geological Survey. Professional paper 162. 1931.
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Beds of the upper part of the Fort Union formation and lower part of the Wasatch formation exposed in the ravine that cuts through Blue Ridge in sec. 5, T. 46 N., R. 97 W. The conspicuous bed near the middle of the section is the massive conglomerate that forms the base of the Wasatch in this region. Hot Springs County, Wyoming. September 29, 1913. Plate 16 in U.S. Geological Survey. Professional paper 145. 1926.
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Anchor mine in S 1/2 sec. 23, T. 25 S., R. 58 E. The ore deposit occurs in the Anchor limestone. The ravine marks the position of a late normal fault. Bird Spring formation; Bullion dolomite member of Monte Cristo limestone; Anchor limestone member of Monte Cristo limestone. Clark County, Nevada. Circa 1921. Plate 38-B, with graphics, in U.S. Geological Survey. Professional paper 162. 1931.
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Aztec sandstone overlying Chinle formation in sec. 22, T. 22 S., R. 58 E., the Aztec sandstone is overlain by thin bedded dolomite of the Goodsprings formation from which it separated by the Keystone thrust fault. Compare with Hewett, photo 365. Clark County, Nevada. Circa 1921. Plate 8-B in U.S. Geological Survey. Professional paper 162. 1931.
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Keystone mine NW 1/4 sec. 30, T. 24 S. R. 58 E. The slopes back of the mine are made up of thin bedded dolomite of the Goodsprings formation. Clark County, Nevada. Circa 1921. Plate 31-A in U.S. Geological Survey. Professional paper 162. 1931.
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Dolomitized zone (light) in bed of limestone of the Bird Spring formation in sec. 33, T. 25 S., R.58 E., view taken diagonally downward toward a bedding plane. Clark County, Nevada. Circa 1921.
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Trace of the Keystone thrust west of Goodsprings in the SW 1/4 sec. 29, T. 24 S., R. 58 E; on the right crumpled limestones (now dolomitized) of the Bird Spring from (Pennsylvanian): on the left thin bedded dolomite of the Goodsprings formation (Upper Cambrian). The trace is marked by a reddish zone formed by the oxidation of pyrite the curve is due to relief and perspective. Clark County, Nevada. Circa 1921. Plate 14-B, with a graphic, in U.S. Geological Survey. Professional paper 162. 1931.
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Yellow pin mine and camp, NW 1/4 sec. 20, T. 24 S., R.54 E., the slopes of Shenandoah Peak (crest of ridge) are made up of thin bedded limestones of the Bird Spring formation. The porphyry sill underlies the smooth slope behind the hoist. Clark County, Nevada. Circa 1921. Plate 35-A in U.S. Geological Survey. Professional paper 162. 1931.
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Potosi mine, south center of sec. 12, T. 23 S., R. 57 E., the mine workings explore a zone at the base of the Yellowpine limestone. Clark County, Nevada. Circa 1921. Plate 33-B in U.S. Geological Survey. Professional paper 162. 1931.
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Wedge of Bullion dolomite separated by faults from blocks of Yellowpine limestone, view northwest toward ridge west of the Bullion mine in sec. 23, T. 25 S., R. 58 E. Clark County, Nevada. Circa 1921. Plate 15-B, with graphics, in U.S. Geological Survey. Professional paper 162. 1931.
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Thin bedded dolomites of the upper part of the Goodsprings formation in secs. 28, 26 and 30, T. 24 S., R.58E: due east from the hill (altitude 5,124 feet west of Kirby Wash toward Columbia Pass and Goodsprings. The town is hidden by the hill in the middle distance. Clark County, Nevada. Circa 1921. Plate 5-A in U.S. Geological Survey. Professional paper 162. 1931.
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Unconformity between Meeteetse formation and Fort Union formation in the NE 1/4 sec, 14, T, 50 N., R. 100W. The basal sandstone of the Fort Union forms the crest of the ridge, and the underlying beds are the upper part of the Meeteetse. At this point 1,300 feet of the Lance formation and several hundred feet of the Meeteetse formation have been eroded: forms a panorama with photo 27. Park County, Wyoming. 1912. Plate 13 in U.S. Geological Survey. Professional paper 145. 1926.
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Arrowhead limestone southeast of the Yellow Pine mine in center of sec. 20 T. 54 S., R. 58 E. Clark County, Nevada. December 13, 1924. Plate 6-B in U.S. Geological Survey. Professional paper 162. 1931.
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Supai formation has overlain by the Kaibab limestone east of Cottonwood Pass, in sec. 13 T. 23 S., R. 58 E. The conspicuous sandstone 460 feet thick forms the middle part of the Supai formation. It is overlain successively by gypsum bearing sandy shale at the top of that formation and the two massive beds of limestone of the Kaibab limestone. Potosi Mountain in the distance. Clark County, Nevada. Circa 1921. Plate 8-A in U.S. Geological Survey. Professional paper 162. 1931.
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Massive conglomerate at the base of the Fort Union formation: in sec. 9. T.45 N., R. 99 W. Park County, Wyoming. September 25, 1912. Plate 12-C in U.S. Geological Survey. Professional paper 145. 1926.
map background search result map search result map Unconformity between Meeteetse formation and Fort Union formation. Park County, Wyoming. 1912. Escarpment of the basal sandstone of the Mesaverde formation dissected near crest of Gooseberry Dome. Park County, Wyoming. 1912. Massive conglomerate at the base of the Fort Union formation. Park County, Wyoming. 1912. Beds of the upper part of the Fort Union formation and lower part of the Wasatch formation exposed in the ravine. Hot Springs County, Wyoming. 1913. Beds of the upper part of the Fort Union formation and lower part of the Wasatch formation exposed in the ravine. Hot Springs County, Wyoming. 1913. Unconformity between Meeteetse formation and Fort Union formation. Park County, Wyoming. 1912. Escarpment of the basal sandstone of the Mesaverde formation dissected near crest of Gooseberry Dome. Park County, Wyoming. 1912. Massive conglomerate at the base of the Fort Union formation. Park County, Wyoming. 1912.